Bathtub



FIG. 1 is a front right perspective view of a bathtub;

FIG. 2 is a front view of the bathtub;

FIG. 3 is a rear view of the bathtub;

FIG. 4 is a right side view and a left side view of the bathtub;

FIG. 5 is a top view of the bathtub;

FIG. 6 is a bottom view of the bathtub; and,

FIG. 7 is a rear left perspective view of the bathtub.

All broken lines in the drawings illustrate portions of bathtub that form no part of the claimed design. 

CLAIM I claim the ornamental design for a bathtub, as shown and described. 